The following table describes the attributes used by the Sideloop PI With Reset Proportional Output module.
Make sure the Process ID and Process Units attributes are set according to the needs of your system. If the Process ID selected is Airflow, Airflow Diff, or Other, you must set the Process Range as necessary. The Process Range must be greater than zero. If Process ID is Other, the user should configure the Time Constant and Process Dead Time attributes from the details view of the PID Pre-Processor logic block description and the Process ID Configuration Restrictions in the Control topic of the Logic section for details.
|
Name |
Type
1
|
Description |
Default Value |
|---|---|---|---|
|
Compensator Cmd |
Controls the valve. The valve is commanded from 0% to 100%. This output incorporates the Lead Compensator. |
0.0 Display Units: % |
|
|
Control Status |
V |
Current status of the module. |
Set Name: Control Status |
|
Direct Acting |
Signals the action of the PID: True = Direct Acting, False = Reverse Acting. Direct acting control is used in applications where an increase in the process variable causes the controller’s present value to increase. An example of direct acting control is temperature control with a cooling coil. With reverse acting control, an increase in the process variable causes the control present value to decrease. Temperature control with a heating coil, flow rate control, or static pressure control applications are three examples of reverse acting control. |
True |
|
|
EFFSL-SP (Setpoint) |
V |
Contains the actual setpoint for the process variable to be controlled to when commanded to Control. |
Display Units: °C, °F |
|
Mode |
Allows the state to be set to Off, Max or Control. |
Control Set Name: Off/Max/Control |
|
|
Output Overridden |
Indicates when the actual output controlled by this output is overridden by a user. |
False |
|
|
Output Position |
Provides the current Present Value of the output that this controller drives. |
0% |
|
|
PID Tuning Reset |
Causes the PID objects to reset their tuning parameters to the default based on the appropriate Process ID. |
Normal Set Name: PID Tuning Reset |
|
|
Percent Cmd |
V |
Controls the single actuator that is providing cooling or heating. |
Display Units: % |
|
Process ID |
Use to specify the process being controlled. |
DA-T Set Name: Process ID |
|
|
Process Range |
Specifies the magnitude of the range that the PID Process Variable traverses as the PID Present Value varies between its minimum and maximum values. You do not need to configure this parameter unless Process ID = Airflow or Airflow Diff. In these cases, Process Range should be configured to the design maximum flow rate of the controlled device. For other Process ID values, the effective process range is determined automatically from the standards table. |
22 °C, 40 °F |
|
|
Process Units |
Specifies the units for the PID. |
°C, °F Set Name: Unit |
|
|
Process Variable |
Specifies that when Mode is commanded to Control, this is the variable that is controlled and must therefore respond to changes in the output. For example, it can be connected to the Zone Temperature. |
22 °C, 72 °F |
|
|
Reset Input |
Used to reset the desired setpoint for the process variable to be controlled to when commanded to Control. |
22 °C, 72,0 °F |
|
|
SL-ABSEFFORT (SL Absolute EWMA Effort) |
Provides an EWMA based on the absolute value of (Current Present Value - Last Present Value). The PID computes this value. |
0.0 Display Units: % |
|
|
SL-ABSERROR (SL Absolute EWMA Error) |
Provides an EWMA based on the absolute value of (Setpoint - Process Variable). The PID computes this value. |
0.0 Display Units: °C, °F |
|
|
SL-ERROR (SL EWMA Error) |
Provides an EWMA based on the difference of (Setpoint - Process Variable). The PID computes this value. |
0.0 Display Units: °C, °F |
|
|
SL-EWMA (SL EWMA Present Value) |
Provides an EWMA of the Present Value. The PID computes this value. |
0.0 Display Units: % |
|
|
SL-OUTSTATE (State) |
G, V |
Current State of the module |
Set Name: Off/Max/Control |
|
SL-RSTA (Reset A) |
Used to set up the span for the Control mode. When the Reset Input is at this value, the effective setpoint is at Setpoint A. |
21 °C, 70 °F |
|
|
SL-RSTB (Reset B) |
Used to set up the span for the Control mode. When the Reset Input is at this value, the effective setpoint is at Setpoint B. |
0 °C, 32 °F |
|
|
SL-SPA (Setpoint A) |
Used to set up the span for the Control mode. This represents the setpoint when the Input is at the Reset A value. |
13 °C, 55 °F |
|
|
SL-SPB (Setpoint B) |
Used to set up the span for the Control mode. This represents the setpoint when the Input is at the Reset B value. |
24 °C, 75 °F |
C - Configuration Mode Only, G - Default Element (Generated State, if applicable), SC - Simulation and Commissioning Modes Only, V - Calculated Value (Outputs)